621666326475 has 36 divisors (see below), whose sum is σ = 1128726555736. Its totient is φ = 327013511040.

The previous prime is 621666326473. The next prime is 621666326521. The reversal of 621666326475 is 574623666126.

It is not a de Polignac number, because 621666326475 - 2¹ = 621666326473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621666326473) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18907969 + ... + 18940818.

Almost surely, 2^621666326475 is an apocalyptic number.

621666326475 is a deficient number, since it is larger than the sum of its proper divisors (507060229261).

621666326475 is a wasteful number, since it uses less digits than its factorization.

621666326475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37848876 (or 37848868 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 54.

The spelling of 621666326475 in words is "six hundred twenty-one billion, six hundred sixty-six million, three hundred twenty-six thousand, four hundred seventy-five".